Undisclosed recipients won't work with mail()

[Fasse]

If you use the PHP mail() function for sending a mail and only set BCC recepients than "undisclosed-recipients:;" won't work.

I look into the code and there is a special way for mail in that case. In the method preSend there will be set "undisclosed-recipients:;" to the parameter $this->mailHeader but this parameter will not be used later anymore.

In the method createHeader() "undisclosed-recipients:;" is handled for the other send methods and it works.

As a simple hack I have changed the if in the createHeader() method so that "undisclosed-recipients:;" will be used if mail is used

    // To be created automatically by mail()
    if ($this->SingleTo === true) {
        if ($this->Mailer != 'mail') {
            foreach ($this->to as $t) {
                $this->SingleToArray[] = $this->addrFormat($t);
            }
        } 
    }
    else {
        if (count($this->to) > 0) {
            if ($this->Mailer != 'mail') {
                $result .= $this->addrAppend('To', $this->to);
            }
        } elseif (count($this->cc) == 0) {
            $result .= $this->headerLine('To', 'undisclosed-recipients:;');
        }
    }

[Synchro]

Thanks